Waterflow - REMEHA Quinta 30 Technical Information

7.4.7 Waterflow

The Quinta series of boilers have no minimum water flow requirement provided the
factory default modulation start point (parameter *) is not raised and the following
conditions are met:
- the two wire modulating controls are used,
- on a pressurised system with the high limit temperature set to flow temperature set
point + 20.
7.5 DHW production
The Remeha Quinta 30 is supplied as standard with an inbuilt DHW control.
This control, when used in conjuction with the optional Broag DHW sensor or ther-
mostat (not a Broag supply), a 3-way diverting valve or DHW pump, can provide boos-
ted primary flow temperature independent of the variable temperature flow for the fully
condensing mode. However it can be independantly time controlled and will isolate the
HTG system during the demand period.
On demand of the DHW sensor or thermostat and depending on parameter J
(reference: Par. 6.6.11), the boiler:
- either operates the three way valve diverting flow water from HTG to the calorifier
(Note: please refer to the resistance graph below)
or
- powers the DHW pump and turns off the HTG or boiler pump.
120
100
80
60
40
20
0
10
Fig. 10 DHW three way valve resistance graph
dP (mBar)
Flow (l/h)
20 30
Output (kW)
39
40 50
3000
2500
2000
1500
1000
500
0
60